US4024941A - Dot matrix type serial printer - Google Patents

Dot matrix type serial printer Download PDF

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Publication number
US4024941A
US4024941A US05/639,853 US63985375A US4024941A US 4024941 A US4024941 A US 4024941A US 63985375 A US63985375 A US 63985375A US 4024941 A US4024941 A US 4024941A
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US
United States
Prior art keywords
rotary disc
head assembly
printing head
carriage
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/639,853
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English (en)
Inventor
Aisuke Sekikawa
Takahiko Aragaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Application granted granted Critical
Publication of US4024941A publication Critical patent/US4024941A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/202—Drive control means for carriage movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/24—Print head assemblies serial printer type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S400/00—Typewriting machines
    • Y10S400/903—Stepping-motor drive for carriage feed

Definitions

  • This invention relates to dot matrix type serial printing devices and more particularly to the means for controlling transverse feed and printing operation of the printing head assembly thereof.
  • the printing head assembly includes a set of printing elements in the form of print wires arranged in vertically aligned relation which each other and electromagnetic actuator means provided for driving the respective printing elements.
  • the printing elements are selectively driven by the actuator means to print a dot or dots on the surface of a paper document or other printing surface each time the printing head assembly is fed transversely a pitch distance.
  • a plurality of the dot columns consecutively printed on the printing surface are related so as to form any desired character or symbol within a definite size of dot matrix.
  • an AC motor has ordinarily been employed as a source of power for feeding the printing head assembly transversely thereof with two clutch mechanisms associated with the AC motor for selection of the direction of movement of the printing head assembly for printing operation and restoration thereof to the rest position.
  • the printer has also included a stationary strap member which extends in the direction of movement of the printing head assembly and is formed therein with a row of slits corresponding to respective printing positions of the printing head assembly; and, in order to detect such slits in the strap member, a photoelectric sensing unit has been mounted on the carriage of the printing head assembly.
  • the power transmission system between the power source and the printing head carriage has unavoidably been complicated, including mechanisms provided independently from each other for transverse feed control of the carriage and for controlling the print wire actuator means of the printing head assembly.
  • the printer has included a large number of component parts, necessitating a high cost of fabrication and a large space for installation.
  • the present invention is intended to overcome the difficulties previously encountered with serial printing devices of the dot matrix type as described above and has for its primary object the provision of a serial printing device of the type concerned which is capable of forming characters or symbols of high quality without any lack of a dot or dots as may result from variation in the rate of transverse feed of the printing head assembly or the carriage thereof.
  • Another object of the present invention is to provide a dot matrix type serial printing device of the character described which is of simplified structure and reduced in cost of fabrication.
  • a further object of the present invention is to provide a dot matrix type serial printing device of the character described which is reduced in power consumption as well as in noise particularly when the printer is idling or in a standby condition.
  • the present invention provides a dot matrix type serial printing device which comprises a printing head assembly including a set of vertically aligned print wires and electromagnetic acutator means therefor, a step motor operatively connected with the carriage of said printing head assembly to impart transverse feed and return movement thereto, a rotary disc fixedly mounted on the output shaft of the step motor and formed with a circularly arcuate slot and a circular row of equally spaced radial slits in concentric relation with each other around the axis of the rotary disc, said radial slits being equal in number to that of the operation steps of the step motor included in each revolution thereof, and stationary detector means including a pair of photoelectric sensors arranged across the rotary disc respectively to scan the arcuate slot and the row of radial slits as the rotary disc rotates with the step motor.
  • the detector means are circuit-connected with the printing head assembly and the step motor in such a manner that a print starting end position is defined for the printing head assembly by one of the opposite end edges of the arcuate slot in the rotary disc as the end edge is detected by one of said photoelectric sensors and that the printing head assembly and the step motor are controlled to operate in timed relation to each other as the raidal slits in the rotary disc are successively detected by the other photoelectric sensor.
  • a step motor is variable in speed of rotation by appropriate electric control means and also reversible in direction of rotation and such motor characteristics are fully utilized in the present invention to realize a highly economical, high performance dot matrix type serial printer which is extraordinarily simple in structure, including as mechanical control means only a rotary disc associated with stationary detector means, and is capable of printing characters of high quality at all times.
  • FIG. 1 is a perspective view of a preferred embodiment of the present invention, schematically illustrating the essential components thereof;
  • FIG. 2 is an enlarged front elevational view of the rotary disc and the detector means associated therewith, both shown in FIG. 1;
  • FIG. 3 is a plan view of the disc and detector means of FIG. 2;
  • FIG. 4 is a schematic diagram illustrating, on an enlarged scale, the arrangement of print wires and an example of dot-printed character, formed within a five by seven dot matrix;
  • FIG. 5 is a circuit diagram illustrating the circuitry used in operating the embodiment of FIG. 1;
  • FIG. 6 is a signal-time chart of the circuit shown in FIG. 5.
  • reference numeral 1 generally indicates a printing head assembly of the printer illustrated, which includes a plurality (seven in this embodiment) of print wires, electromagnetic print wire actuators 2 provided one for each print wire, and a wire guide section 4.
  • the print wires 3 are guided through the wire guide section 4 so that the printing end portions of print wires 3 are held vertically aligned, as schematically illustrated in FIG. 4, in positions opposite to the platen 5 of the printer with a paper document and an inking ribbon (both not shown) interposed therebetween.
  • FIG. 4 is illustrated an example of the alphabetic character, H, printed on the paper document by the print wires as they are selectively actuated while the printing head 1 is fed transversely in the printing direction.
  • the printing head 1 is mounted on a carriage 6 which is guided by guide rods 7 and 8 so as to move back and forth in front of the platen 5 in directions parallel to the axis thereof under the control of a step motor 9, as indicated by the double arrow 6a.
  • Reference numerals 10 and 11 indicated a pair of wire ropes provided to drive the carriage 6 in respective directions.
  • the wire ropes 10 and 11 are securely wrapped at one end around a drive pulley 12 fixedly mounted on one end of the output shaft of the step motor 9 and, extend respectively over guide pulleys 13-14 and 15-16, and have their other ends secured to the carriage 6 on the opposite sides thereof.
  • Reference numeral 17 indicates a rotary disc fixedly mounted on the other end of the output shaft of step motor 9; 18 indicates a stationary detector unit secured to the frame body (not shown) of the printer in straddling relation to the rotary disc; and 19 indicates a limit switch provided on the printer base to serve the purpose of defining the left-hand end position of the carriage 6 and arranged so as to be operated by an appropriate dog means (not shown) secured to a bottom portion of the carriage 6.
  • reference numeral 20 indicates radially aligned slits formed in the rotary disc 17 and arranged at equal intervals along a circular row adjacent the outer periphery thereof.
  • the radial slits 20 are equal in number to that of the operation steps of step motor 9 included in each revolution thereof.
  • Reference numeral 21 indicates a circularly arcuate elongated slot formed in the same rotary disc 17 in concentric relation with the circular row of radial slits 20. As shown, the arcuate slot 21 has one of its opposite end edges, 22, arranged in radially aligned relation with one of the opposite side edges of one of the radial slits 20.
  • the stationary detector unit 18 includes a pair of photoelectric sensors 23 and 24 arranged adjacent to the rotary disc 17 and one of the photoelectric snesors, 23, is aligned to scan the row of radial slits 20 and successively detect the individual slits 20 as the rotary disc 17 rotates with the step motor 9.
  • the other photoelectric sensor 24 is aligned to scan the arcuate slot 21 and particularly detect its end edge 22.
  • the radial slits 20 formed at equal intervals in a circular arrangement in rotary disc 17, are successively detected by the photoelectric sensor 23, the output of which is fed to the control circuit, which will be described hereinafter, to serve the purpose of causing the step motor 9 to rotate stepwise at a constant rate so that the printing head carriage 6 is fed transversely stepwise at a constant rate.
  • the diameter of drive pulley 12 mounted on the output shaft of step motor 9 is so determined that the amount of rotation of the rotary disc 17 for each of the radial slits 20, that is, the magnitude of the pitch angle ⁇ indicated in FIG.
  • the print wire actuators 2 are selectively energized each time the photoelectric sensor 23 detects one of the radial slits 20 formed in the rotary disc 17 so that dot columns are printed with a pitch distance of length l to form a character or symbol within each dot matrix, as illustrated in FIG. 4.
  • the printing operation proceeds as the carriage 6 is fed successively to the right, and, when the carriage reaches the right-hand end of its printing stroke, the step motor 9 is reversed in the direction of rotation under an appropriate signal to restore the carriage 6 to its rest position. It will be readily understood that the returning movement of the carriage 6 can be effected at a rate several times greater than that of carriage movement during the printing stroke by appropriate electric circuit means.
  • the limit switch 19 is operated to produce a signal which serves, through appropriate circuit means, to start braking the step motor 9.
  • the step motor 9 and rotary disc 17 continue to rotate for a while and, in the meantime, the end edge 22 of the arcuate slot 21 in the rotary disc 17 is detected by the photoelectric sensor 24.
  • the arrow B indicates the direction of rotation of the rotary disc 17 during the return movement of carriage 6.
  • the limit switch 19 decides that the carriage 6 has reached its print starting end position only upon receiving the output signal from the photoelectric sensor 24, allowing the motor 9 to continue to drive the carriage 6 further to the left. In this manner, the carriage 6 comes to stop only when it has been driven past its print starting end position by a distance several times as large as the character spacing.
  • the term "print starting end position” means the carriage position where the actual printing operation is started for each line of characters. It is to be noted that the length of the arcuate slot 21 in the rotary disc 17 is determined so as to be kept effectively sensed by the photoelectric sensor 24 even after the carriage 6 has been completely restored.
  • the rest position or the extreme left-hand end position of the carriage 6, which is deliberately spaced leftward from the print starting end position thereof, as described herein, is intended to prevent the printed data in the starting end portion of the preceding line from being concealed from operator by the printing head assembly and particularly the wire guide section 4 thereof.
  • the step motor 9 and rotary disc 17 are started by appropriate electric circuit means to rotate in the printing direction, i.e., in the direction indicated in FIG. 2 by the arrow A and, when they have turned through an angle corresponding to the sum of a predetermined number of character spacings, the photoelectric sensor 24 of the detector unit 18 detects the trailing end edge 22 of the arcuate slot 21, formed in the rotary disc 17 to define the print starting end position of the printing head assembly 1 and causes the latter to start printing operation.
  • the printing operation is actually started when one of the radial slits 20 in the rotary disc is detected by the photoelectric sensor 23 immediately after the end edge 22 of the arcuate slot 21 has been detected by the photoelectric sensor 24.
  • the printing head assembly and the step motor operate continuously in precisely timed relation to each other under the control of the row of radial slits 20, as described hereinbefore.
  • Electric circuit means employed with the printer described for effecting printing operation and transverse feed movement of the printing head assembly will be outlined below with reference to FIGS. 5 and 6, which illustrated the general arrangement of the printer circuit and the signal-time chart thereof, respectively.
  • the signal from the photoelectric sensor 24 and that from the limit switch 19, provided to detect the left-hand end position of the carriage 6, are fed through respective shaping circuits 25 and 26 into a NAND gate 27 to form a print range signal A, which determines a range of line within which characters can be actually printed.
  • This signal A is fed to the SET terminal of an address counter 29 provided to produce an address signal B, which is fed to a character generator 28.
  • the address designation to the character generator 28 remains unchanged and no printing operation is effected; and only when the print range signal A rise "high" , the address counter 29 starts to take count of each pulse of print timing signal C as it is fed thereto and printing operation is starting to print dot columns as print wire actuator circuits 31 connected with the character generator 28 through respective AND gates 30 are selectively energized.
  • the print timing signal C appears at the output of a differentiating circuit 33, which is fed with the output of the photoelectric sensor 23 through a shaping circuit 32 as the sensor 23 detects radial slits 20 formed in the rotary disc 17.
  • the return stroke of the printing head assembly is started upon reception of a return signal CR and subsequently, when the sensor 24 detects the end edge 22 of the arcuate slot 21 in the rotary disc 17, the print range signal A becomes "low” or off indicating that the printing head assembly has reached its print starting end position.
  • a counter 34 arranged separate from the address counter 29 takes count for a while of the pulses of print timing signal C to caus the printing head assembly to continue its return movement until the assembly comes to a halt in a predetermined position spaced to the leftward of its print starting end position by a distance corresponding to the sum of a number of character spacings.
  • reference character D designates the output signal from the photoelectric sensor 24 scanning the arcuate slot 21 in the rotary disc 17 to detect its end edge 22; and E designates the output signal from the stroke end detecting limit switch 19.
  • both counters 29 and 34 are binary counters of the radix-16 type; and reference numeral 35 indicates a monostable multivibrator; 36, a decoder; 37, an inverter; 38, an AND gate; 39 and 40, cross-coupled NAND gates.
  • the respective functions of these circuit components will be apparent to those skilled in the art and a detailed description thereof is omitted herein for purposes of brevity.
  • the serial printing device of the invention is particularly simplified in structure with a minimum of movable component parts, including, among others, a step motor as a source of power for transverse feed of the printing head assembly and a combination of a rotary disc secured to the output shaft of the step motor with a stationary detector unit as means for controlling the motor operation and the dot-printing operation of the printing head assembly and is capable of forming clearly legible characters or symbols without any lack of a dot or dots.
  • a step motor as a source of power for transverse feed of the printing head assembly
  • a combination of a rotary disc secured to the output shaft of the step motor with a stationary detector unit as means for controlling the motor operation and the dot-printing operation of the printing head assembly and is capable of forming clearly legible characters or symbols without any lack of a dot or dots.

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  • Character Spaces And Line Spaces In Printers (AREA)
US05/639,853 1974-12-18 1975-12-11 Dot matrix type serial printer Expired - Lifetime US4024941A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JA49-145161 1974-12-18
JP49145161A JPS5759828B2 (de) 1974-12-18 1974-12-18

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US4024941A true US4024941A (en) 1977-05-24

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US05/639,853 Expired - Lifetime US4024941A (en) 1974-12-18 1975-12-11 Dot matrix type serial printer

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US (1) US4024941A (de)
JP (1) JPS5759828B2 (de)
FR (1) FR2294852A1 (de)
IT (1) IT1051165B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176977A (en) * 1978-03-08 1979-12-04 Realty & Industrial Corporation Proportional carrier control and moving mechanism for electric typewriter
US4195938A (en) * 1977-02-09 1980-04-01 Sycor, Inc. Lateral position control means for data printer heads
US4210404A (en) * 1977-11-01 1980-07-01 General Electric Company Printhead compensation arrangement for printer
US4225251A (en) * 1978-01-09 1980-09-30 The Rank Organisation Limited Electro-mechanical printing apparatus
US4507002A (en) * 1982-11-26 1985-03-26 Citizen Watch Co., Ltd. Printing timing correction device in shuttle type dot line printer
US4602882A (en) * 1982-08-05 1986-07-29 Seiko Epson Corporation Control system of serial printer
US4643596A (en) * 1979-09-17 1987-02-17 Seikosha Co., Ltd. Impact type dot printer
US4667098A (en) * 1985-03-29 1987-05-19 The United States Of America As Represented By The Secretary Of The Army Multi-track optical shaft position and timing cylinder
US4669897A (en) * 1981-07-07 1987-06-02 Canon Kabushiki Kaisha Dot matrix printer capable of varying character size
US4693618A (en) * 1980-02-22 1987-09-15 Canon Kabushiki Kaisha Dot matrix printer providing multiple print pulses for one energization of a printing head stepping motor
US5007751A (en) * 1987-10-16 1991-04-16 Brother Kogyo Kabushiki Kaisha Printer having carriage zeroing device
US5788385A (en) * 1991-09-19 1998-08-04 Canon Kabushiki Kaisha Serial recording system capable of varing resolution
US5867182A (en) * 1989-07-05 1999-02-02 Canon Kabushiki Kaisha Recording apparatus including recording head provided with a character generator

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5331921A (en) * 1976-09-06 1978-03-25 Seikosha Kk Method of driving printing head
JPS5356513A (en) * 1976-11-02 1978-05-23 Suwa Seikosha Kk Printer
JPS5395026A (en) * 1977-01-31 1978-08-19 Ricoh Co Ltd Dot shift preventing device
CA1099818A (en) * 1977-02-09 1981-04-21 William Wegryn Method and apparatus for setting and varying margins and line spacing on data printers
JPS54136921A (en) * 1978-04-14 1979-10-24 Sanyo Electric Co Printer
JPS5642666A (en) * 1979-09-17 1981-04-20 Seikosha Co Ltd Impact type dot printer
JPS5770683A (en) * 1980-10-21 1982-05-01 Seiko Instr & Electronics Ltd Printer
EP0107501A3 (de) * 1982-10-27 1985-08-28 Royden C. Sanders, Jr. Positionsanzeiger für einen Schnelldrucker

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3292530A (en) * 1964-11-05 1966-12-20 Ibm Print head controls causing overtravel of head at left end
US3566782A (en) * 1968-08-21 1971-03-02 Singer Co Address synchronizer
US3825681A (en) * 1973-01-05 1974-07-23 Singer Co Data terminal with dual three-station printing
US3831728A (en) * 1972-12-11 1974-08-27 Ibm Ink jet printing apparatus with overrun of printhead to insure better visibility
US3891077A (en) * 1972-10-27 1975-06-24 Bosch Gmbh Robert High-speed printer
US3905463A (en) * 1973-02-12 1975-09-16 Bunker Ramo Control element for electrical reading or recording device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168182A (en) * 1963-03-21 1965-02-02 David W Bernard Type wheel shifting and impacting means in high speed printers
JPS4991545A (de) * 1972-12-23 1974-09-02

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3292530A (en) * 1964-11-05 1966-12-20 Ibm Print head controls causing overtravel of head at left end
US3566782A (en) * 1968-08-21 1971-03-02 Singer Co Address synchronizer
US3891077A (en) * 1972-10-27 1975-06-24 Bosch Gmbh Robert High-speed printer
US3831728A (en) * 1972-12-11 1974-08-27 Ibm Ink jet printing apparatus with overrun of printhead to insure better visibility
US3825681A (en) * 1973-01-05 1974-07-23 Singer Co Data terminal with dual three-station printing
US3905463A (en) * 1973-02-12 1975-09-16 Bunker Ramo Control element for electrical reading or recording device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195938A (en) * 1977-02-09 1980-04-01 Sycor, Inc. Lateral position control means for data printer heads
US4210404A (en) * 1977-11-01 1980-07-01 General Electric Company Printhead compensation arrangement for printer
US4225251A (en) * 1978-01-09 1980-09-30 The Rank Organisation Limited Electro-mechanical printing apparatus
US4176977A (en) * 1978-03-08 1979-12-04 Realty & Industrial Corporation Proportional carrier control and moving mechanism for electric typewriter
US4643596A (en) * 1979-09-17 1987-02-17 Seikosha Co., Ltd. Impact type dot printer
US4693618A (en) * 1980-02-22 1987-09-15 Canon Kabushiki Kaisha Dot matrix printer providing multiple print pulses for one energization of a printing head stepping motor
US4669897A (en) * 1981-07-07 1987-06-02 Canon Kabushiki Kaisha Dot matrix printer capable of varying character size
US4602882A (en) * 1982-08-05 1986-07-29 Seiko Epson Corporation Control system of serial printer
US4507002A (en) * 1982-11-26 1985-03-26 Citizen Watch Co., Ltd. Printing timing correction device in shuttle type dot line printer
US4667098A (en) * 1985-03-29 1987-05-19 The United States Of America As Represented By The Secretary Of The Army Multi-track optical shaft position and timing cylinder
US5007751A (en) * 1987-10-16 1991-04-16 Brother Kogyo Kabushiki Kaisha Printer having carriage zeroing device
US5867182A (en) * 1989-07-05 1999-02-02 Canon Kabushiki Kaisha Recording apparatus including recording head provided with a character generator
US5788385A (en) * 1991-09-19 1998-08-04 Canon Kabushiki Kaisha Serial recording system capable of varing resolution

Also Published As

Publication number Publication date
JPS5171628A (de) 1976-06-21
FR2294852A1 (fr) 1976-07-16
FR2294852B1 (de) 1983-04-22
IT1051165B (it) 1981-04-21
JPS5759828B2 (de) 1982-12-16

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